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<p>Jan,</p>
<p> The idea is that gas-fired water heaters sometimes have a
chimney that runs from the burner up through the tank. When the
burner is active then the air/exhaust in the chimney is hot and
the water in the tank gains a little energy from the
conduction/convection heat transfer from the chimney air to the
water. When the burner is not active then the air in the chimney
is not hot and there can be additional energy losses from the tank
water to that air. The amount of loss is controlled by a parameter
that asks what the u-value of the flue is and by the input that
sets the temperature of the air/exhaust in the flue. If you want
to deactivate those losses you can set the flue u-value to zero.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/2/2023 5:48 AM, Böttner, Jan via
TRNSYS-users wrote:<br>
</div>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m using the storage
tank type 534.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This tank has gasflue
losses, which I don’t quite understand from reading the
documentation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But the way I understand
it, it doesn’t apply for the tank I am modelling.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So I would like to
deactivate these losses, as they make up for about 10% for
my energy supply.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jan<o:p></o:p></span></p>
</div>
<br>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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